Ultrastructure of the "germinal plasm" during maturation and early cleavage in Rana pipiens.
D000557:Ambystoma / Q000196:embryology; D000818:Animals; D004625:Embryo, Nonmammalian / Q000166:cytology*; D005260:Female; D005306:Fertilization; D008854:Microscopy, Electron; D010063:Ovum / Q000166:cytology*; D011894:Rana pipiens / Q000033:anatomy & histology / Q000196:embryology*; D013997:Time Factors